Bump Kafka Download version

Bump Kafka download version to fix integration test builds

Author: robbavey

ci/build.sh

@@ -9,7 +9,7 @@ set -e
 
 ./ci/setup.sh
 
-export KAFKA_VERSION=2.1.0
+export KAFKA_VERSION=2.1.1
 ./kafka_test_setup.sh
 bundle install
 bundle exec rake vendor

kafka_test_setup.sh

@@ -5,7 +5,7 @@ set -ex
 if [ -n "${KAFKA_VERSION+1}" ]; then
   echo "KAFKA_VERSION is $KAFKA_VERSION"
 else
-   KAFKA_VERSION=2.1.0
+   KAFKA_VERSION=2.1.1
 fi
 
 export _JAVA_OPTIONS="-Djava.net.preferIPv4Stack=true"